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A Method for Improving the Strength and Crack Resistance of Aluminum Alloy Weld

A welding seam strength and aluminum alloy technology, which is applied in the field of non-ferrous metals and their preparation, can solve the problem that the strength of welded joints does not reach the strength level of 7xxx series alloys, and achieve the effect of no welding hot cracks

Active Publication Date: 2019-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lower alloy degree of this type of alloy compared with the 7xxx series alloy, the strength of the welded joint still does not reach the strength level of the 7xxx series alloy, which makes its application have certain limitations.

Method used

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  • A Method for Improving the Strength and Crack Resistance of Aluminum Alloy Weld
  • A Method for Improving the Strength and Crack Resistance of Aluminum Alloy Weld
  • A Method for Improving the Strength and Crack Resistance of Aluminum Alloy Weld

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] All experimental alloys and reference alloys involved in this example were prepared in the laboratory. The equipment and general processes (smelting, rolling, annealing, etc.) used in the alloy preparation process were exactly the same. There were four kinds of alloys with different compositions. The ingredients and uses are shown in Table 1.

[0021] Table 1 Alloy chemical composition and application table (mass percentage, wt%) used in the present invention

[0022] alloy

use

Mg

Zn

Mn

Cu

Cr

Ti

Zr

Fe

Si

5083

5xxx Reference Alloys

5.0

0

0.80

0.15

0.03

0.07

0.15

0.20

0.15

5059

5xxx Reference Alloys

5.0

1.0

0.80

0.15

0.03

0.07

0.15

0.20

0.15

7039

7xxx Reference Alloys

3.0

4.0

0.25

0.05

0.2

0.07

--

0.15

0.15

Al-Mg-Zn

invention alloy

5.0

3.0

0.80

0.15

0.03

0.07

0.15

0.20

0.15 ...

Embodiment 2

[0041] The invention and gold composition used in this example are shown in Table 4. The mass fraction of the main alloy element Zn is reduced to 2.5%, and the mass fraction of Mg is reduced to 4.5%.

[0042] Table 4 Alloy chemical composition and application table (mass percentage, wt%) used in the present invention

[0043]

[0044]

[0045] The welding and post-weld aging process of the alloy sheet described in this example is as follows:

[0046] The working parameters of the MIG welding machine used are: filling ER5556 welding wire, welding machine working current, welding machine working current 75A, working voltage 10.5V, arc starting dwell time 2.0s, wire filling speed 7m / min, welding speed 8mm / s, The flow rate of argon gas is 16.5L / min, and the welded plate is subjected to appropriate natural aging or artificial aging. The specific process of artificial aging after welding is as follows: heating the welded plate to 95°C and keeping the temperature for 170h, and ...

Embodiment 3

[0049] The composition of the inventive alloy used in this example is shown in Table 5. The content of the main alloy element Zn is increased to 3.5% by mass, and the mass content of Mg is increased to 6%.

[0050] Table 5 Alloy chemical composition and application table (mass percentage, wt%) used in the present invention

[0051] alloy

use

Mg

Zn

Mn

Cu

Cr

Ti

Zr

Fe

Si

5083

5xxx Reference Alloys

5.0

0

0.80

0.15

0.03

0.07

0.15

0.20

0.15

5059

5xxx Reference Alloys

5.0

1.0

0.80

0.15

0.03

0.07

0.15

0.20

0.15

7039

7xxx Reference Alloys

3.0

4.0

0.25

0.05

0.2

0.07

--

0.15

0.15

Al-Mg-Zn

invention alloy

5.8

3.5

0.80

0.15

0.03

0.07

0.15

0.20

0.15

[0052] The welding and post-weld aging process of the alloy sheet described in this example is as follows:

[0053] The working parameters of th...

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Abstract

The invention discloses a method for improving aluminum alloy weld joint strength and crack resistance and belongs to the field of nonferrous metals and preparation of nonferrous metals. The method comprises the steps that Al-Mg-Zn system alloy plates prepared from, by mass, 4.0-7.0% of Mg, 2.0-4.0% of Zn, 0-0.6% of Cu, 0.1-1.2% of Mn, 0-0.1% of Cr, 0-0.25% of Ti, 0-0.3% of Zr, 0-0.6% of Fe, 0-0.6% of Si and the balance Al are subjected to MIG welding, and artificial aging treatment is carried out after welding. Due to the fact that Al-Mg-Zn ally has the aging precipitation ability, the weld joint strength is greatly improved compared with 5xxx system reference alloy(AA5059 and AA5083) through welding and post-welding aging reinforcement and is approximate to the weld joint strength level of 7xxx system reference alloy, the weld crack resistance of the weld joint is approximate to that of 5xxx system reference alloy and obviously better than that of 7xxx system reference alloy, no weld heat crack is produced, and the method is quite applicable to production and manufacturing processes of ships and decks.

Description

technical field [0001] The invention belongs to the field of non-ferrous metals and their preparation, and in particular relates to a method for improving the strength and crack resistance of an aluminum alloy welding seam, which is suitable for the production process of ships and armor plates. Background technique [0002] In the ship transportation and military armor industries, it has become a new trend to use high specific strength aluminum alloy materials to replace traditional steel materials, which can significantly reduce the overall weight of ships and armored vehicles while maintaining the same strength of the alloy. Significantly improve the efficiency of ship fuel utilization and the combat maneuverability of armored vehicles. Since ships and armored materials have the characteristics of large area and high span, metal joining processes (mainly welding) must be used to connect small-sized raw materials to each other during the production process. After performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/08C22C21/06C21D9/50B23K9/173B23K9/095
CPCB23K9/095B23K9/173C21D9/50C22C21/06C22C21/08C22F1/047
Inventor 张迪赵鑫侯胜利张济山庄林忠
Owner UNIV OF SCI & TECH BEIJING
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